Thermal properties of Li4/3Ti5/3O4/LiMn2O4 cell

Abstract The thermal properties of Li 4/3 Ti 5/3 O 4 and Li 1+ x Mn 2 O 4 electrodes were investigated by isothermal micro-calorimetry (IMC). The 150-mAh g −1 capacity of a Li/Li 4/3 Ti 5/3 O 4 half cell was obtained through the voltage plateau that occurs at 1.55 V during the phase transition from spinel to rock salt. Extra capacity below 1.0 V was attributed to the generation of a new phase. The small and constant entropy change of Li 4/3 Ti 5/3 O 4 during the spinel/rock-salt phase transition indicated its good thermal stability. Accelerated rate calorimetry confirmed that Li 4/3 Ti 5/3 O 4 has better thermal characteristics than graphite. The IMC results for a Li/Li 1+ x Mn 2 O 4 half cell indicated less heat variation due to the suppression of the order/disorder change by lithium doping. The heat profiles of the Li 4/3 Ti 5/3 O 4 /Li 1+ x Mn 2 O 4 full cell indicated less heat generation compared with a mesocarbon-microbead graphite/Li 1+ x Mn 2 O 4 cell.

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